---
{
    "title": "concat_ws",
    "language": "en"
}
---

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## concat_ws
### Description
#### Syntax

`VARCHAR concat ws (VARCHAR sep, VARCHAR str,...)`


Using the first parameter SEP as a connector, the second parameter and all subsequent parameters are spliced into a string.
If the separator is NULL, return NULL.
` The concat_ws` function does not skip empty strings, but NULL values.

### example

```
mysql> select concat_ws("or", "d", "is");
+----------------------------+
| concat_ws('or', 'd', 'is') |
+----------------------------+
| doris                      |
+----------------------------+

mysql> select concat_ws(NULL, "d", "is");
+----------------------------+
| concat_ws(NULL, 'd', 'is') |
+----------------------------+
| NULL                       |
+----------------------------+

mysql> select concat_ws("or", "d", NULL,"is");
+---------------------------------+
| concat_ws("or", "d", NULL,"is") |
+---------------------------------+
| doris                           |
+---------------------------------+
```
### keywords
CONCAT_WS,CONCAT,WS